See what is happeing on AlternativeTo
Pretty minimalistic on first look. But under the hood, it's a very powerful tool for creating all sorts of mockups and design ideas.
I personally find Vectornator a better product than Affinity Designer in many ways - one of the main reasons is that AD is kind of buggy, and for the longest time I was ok with that since I enjoyed...
Affordable price and better interface than Inkscape.